Sauropodomorpha is an extinct clade of long-necked, herbivorous, saurischian dinosaurs that includes the sauropods and their ancestral relatives. The "prosauropods", which preceded the sauropods, were smaller and were often able to walk on two legs. Sauropods had very long necks, long tails, small heads (relative to the rest of their body), and four thick, pillar-like legs. They are notable for the enormous sizes attained by some species, and the group includes the largest animals to have ever lived on land.

When i started to make this image,i noted that there are giants seen from all the well known sauropod group except brachiosaurids which bothered me. At least there should be one giant brachiosaurid rivaling or coming close in size to the giant diplodocids and giant titanosaurs.

You should ask that question to Nima. The weird thing about Sauroposeidon is that it's shoulder is only slightly taller than Brachiosaurus but a longer neck.This seemed strange to me.A while ago i asked a question to a palaeontologist about why not Sauroposeidon could have a somewhat high shoulder.He said that it might have had a high shoulder too. In wiki, it is mentioned as the neck of Sauroposeidon was 25% longer than Giraffatitan but it's diameter was only slightly more which means a low shoulder for a long neck.Well, i don't understand it. I would expect any huge Brachiosaurus to be a scaledup B.altithorax as you get a high shoulder. That is how Abydosaurus and Fusuisaurus look like in Nima's reconstruction. Of course we don't know if the few giant Brachiosaurids were exactly like B.altithorax with few fragmentary materials. There is no doubt that definitely some Brachiosaur was about the size of Abydosaurus as seen in the image or even more. The few massive Brachiosaurs may not weigh as much as the largest titanosaurs but could be taller than them,including shoulder height. Which undescribed brachio you are talking about? Breviparopus, Archbishop?

I agree there. Sauroposeidon is now believed to be a Chubutisaur though along with Paluxysaurus (not a juvenile Sauroposeidon) and the French Monster. They still had quite vertical postures, but not as much as brachiosaurs- same with limb proportions.

Brevi was probably only slightly larger than Giraffatitan based off footprint sizes for both, Ultrasauripus was definitely bigger and likely had brachiosaurus like proportions as its close to Fusuisaurus. Archbishop and Potter Creek were also larger than Giraffatitan. Then there's "B. nougeredi" and the Gara Samari track maker which were likely even bigger than Fusuisaurus. Nima will do a chart with both of the latter eventually.